CAT4134 Datasheet, PDF (4/13 Pages) Catalyst Semiconductor – 500mA Dual Channel Movie/Flash LED Driver

CAT4134
TYPICAL CHARACTERISTICS
VIN = 3.6V, FLASH = VIN, C_IN = 4.7µF, C_OUT = 10µF, L = 22µH with 2 LEDs at 100mA, T_AMB = 25ºC, unless
otherwise specified.
LED Current Regulation (100mA load)
2.0
1.5
1.0
0.5
1 LED
0.0
2 LEDs
-0.5
-1.0
-1.5
-2.0
2.5
3.0
3.5
4.0
4.5
INPUT VOLTAGE [V]
LED Current Regulation (200mA load, Flash)
2.0
1.5
1.0
0.5
0.0
2 LEDs
-0.5
-1.0
-1.5
-2.0
2.5
3.0
3.5
4.0
4.5
INPUT VOLTAGE [V]
Current Gain vs. RFLASH
1900
1850
1800
2 LEDs
VIN= 3.6V
1750
1700
1650
1600
0
50 100 150 200
Rflash [kohm]
LED Current Regulation (100mA load, Flash)
2.0
1.5
2 LEDs at 100mA
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
2.5
3.0
3.5
4.0
4.5
INPUT VOLTAGE [V]
Efficiency vs. Output Current (Flash mode)
90
80
70
60
VIN = 3.6V
50 ^{2 LEDs}
40
0
50 100 150 200 250
TOTAL LED CURRENT [mA]
Efficiency vs. Input Voltage (Flash mode)
90
80
70
60
2 LEDs at 100mA
50
40
2.5 3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE [V]
Doc. No. 5021 Rev. A
4
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice.